Parizek also told the Des Moines Register that the man is well and had "no physical or weather-related injuries."

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Des Moines police are asking for the public's assistance in searching for an autistic man who went missing around 3:40 p.m. on Friday.

Riley Mackel, 21, was last seen around Union Park at 725 Thompson Ave. in Des Moines, according to police.

He was last seen wearing a gray sweatshirt with "Guess" across the front, gray sweatpants and tan shoes.

Mackel is non-verbal and, for comfort, he may have a pacifier in his mouth, according to police. He is also tall, Sgt. Paul Parizek, a spokesman for Des Moines police, told the Register.

The temperature is currently 32 degrees in Des Moines and is expected to drop to just 29 degrees, wind chills in the low 20s and wind gusts as high as 22 miles per hour overnight, according to the National Weather Service.

Des Moines police are hoping to find him before it gets much colder outside.

"The most critical thing is he’s autistic and non-verbal and he needs the care support he gets during the day," Parizek said. "He can’t communicate that he needs help, so we’re hoping, if folks see him, they'll let us know."

Anyone with information about Mackel's whereabouts is asked to call Des Moines police at 911 or 515-283-4811.